Characterizing Kimberlite Dilution by Crustal Rocks at the Snap Lake Diamond Mine (Northwest Territories, Canada) using SWIR (1.90–2.36μm) and LWIR (8.1–11.1μm) Hyperspectral Imagery Collected from Drill Core

Short-wave infrared (SWIR, 1.90–2.36 μm) and long-wave infrared (LWIR, 8.1–11.1 μm) hyperspectral collected using the SisuROCK system were used to develop an automated methodology for generating dilution maps. Smoothed and denoised images from two Snap Lake (Northwest Territories, Canada) drill cores were processed, and SWIR and LWIR spectral endmembers were extracted from the with each mineralogical endmember assigned to one of four compositional groups: undiluted kimberlite, kimberlite, micro- and macrodiluted kimberlite, and crustal rocks. These endmembers were to classify the SWIR and LWIR images, and the results were validated using linescan data, drill core logs, reports, and the results of X-ray diffraction, Raman spectroscopy, and Micro-Fourier Transform Infrared (FTIR) spectroscopy. This study demonstrates that hyperspectral imagery can be used to generate dilution for hypabyssal kimberlites that far supersede other current techniques in terms of spatial resolution.